Constructing Quadrilaterals by Four Sides (2014)

[b](Revised in July 2014)
[/b]Classifying quadrilaterals by the four sides and whether or not they have right angles or parallel sides.
Anthony Or, GeoGebra Institute of Hong Kong.
orchiming@gmail.com
（繁體中文版：http://www.geogebratube.org/material/show/id/578）